V6 Coupe Strange Behaviour

[Daviewonder 533 3 Cars]

Hi all

 

Recenty my girlfriends R reg V6 coupe has been running and starting badly and tonight I realised the engine management temp sensor had come unplugged due to not having the wire clip on it so I guess the car had been running in limp mode. I plugged it back in and at the same I fitted a new centre section of exhaust due to the old one rusting through.

The car started ok and drove lovely until about a mile into the journey, the car seemed to be holding back and shaking and vibrating and felt kind of like something was rubbing against the tyres (the only similar thing I've felt is when the top engine mount went on my 106 and the engine was vibrating through the body). I slowed down and pulled over but couldn't find anything wrong apart from a lot of smoke coming from the exhaust, the smoke cleared and I drove away slowly and everything was ok. I then did a 5 mile journey and everything is fine now.

 

I'm totally stumped on this one any ideas Guys?

[Rob Turbo 3]

These ecu's have a sort of calibration for the sensors, if a sensor has been replaced you're supposed to disconect the battery for a while so it resets then run the car for 10 minutes inc. some time at idle, during this time it gathers calibration data from various sensors so the idle may be high or low and it might not run great. After 10 mins you're supposed to switch off the ignition, then back on, then check for fault codes.

 

According to peugeot planet, failing to do this can result in poor starting/running, so maybe it constantly updates this calibration data over time and with the temp sensor being disconnected it got used to it, when it was plugged back in it started over with the calibration?

[ade 4wd 11]

Sounds like you had a misfire. What colour was the smoke, white, black or blue?

[Daviewonder 533 3 Cars]

These ecu's have a sort of calibration for the sensors, if a sensor has been replaced you're supposed to disconect the battery for a while so it resets then run the car for 10 minutes inc. some time at idle, during this time it gathers calibration data from various sensors so the idle may be high or low and it might not run great. After 10 mins you're supposed to switch off the ignition, then back on, then check for fault codes.

 

According to peugeot planet, failing to do this can result in poor starting/running, so maybe it constantly updates this calibration data over time and with the temp sensor being disconnected it got used to it, when it was plugged back in it started over with the calibration?

 

I did wonder if it could be to do with it coming off limp mode and resetting itself but convinced myself otherwise. I'll do the reset thing tomorrow, cheers

 

Sounds like you had a misfire. What colour was the smoke, white, black or blue?

 

The smoke was white, the whole car seemed to be vibrating. It was so wierd I even checked the time to make sure we hadn't lost any due to being obducted by aliens! (I'm not even joking)

[smithy 1]

It could have been caused by the over fuelling when coolant temp was disconnected.

Not sure if still applies but when I worked at pug back in nineties the ecu's were re calibrated after clearing faults/disconnecting battery by using the rally method as pug called it.

Start engine leave to idle with headlights and rear heated screen on until cooling fan cuts in,then give car a 45 minute drive at different speeds keeping rpm high.

 

They used to run so much better after doing it especially the higher performance engines

[Daviewonder 533 3 Cars]

It could have been caused by the over fuelling when coolant temp was disconnected.

Not sure if still applies but when I worked at pug back in nineties the ecu's were re calibrated after clearing faults/disconnecting battery by using the rally method as pug called it.

Start engine leave to idle with headlights and rear heated screen on until cooling fan cuts in,then give car a 45 minute drive at different speeds keeping rpm high.

 

They used to run so much better after doing it especially the higher performance engines

 

 

Might give this a go

[Carl Chambers 7 2 Cars]

Engine mounts are prone to breaking on these, my v6 estate was when I got it and my mate Adam has had 3 coupes which all broke the top drivers side mount, and hes even managed to break the one on his 407 v6 sw!

 

Plus the coilpacks are prone to going, so check them as well!